Piston cooling nozzle with small distance between axes
According to the invention, an internal combustion engine piston cooling nozzle comprises a nozzle body, a transverse fixing plate and screwing means such as a fixing screw offset laterally at a distance between axes. The nozzle body comprises an axial bore containing valve means and a transverse bore receiving a cooling fluid outlet duct. The peripheral wall is thick around the transverse bore. The diametrally opposite portion of the peripheral wall is thinner because of the presence of an external recess facing the fixing screw. Thus the fixing screw may be moved closer, by reducing the distance between axes, which reduces the overall size of the cooling nozzle.
1. An internal combustion engine piston cooling nozzle comprising:
a nozzle body with a peripheral wall around an axial bore containing valve means, a transverse bore communicating with the axial bore passing through the peripheral wall and being connected to a cooling fluid outlet duct, the nozzle body having a cylindrical inlet portion conformed to be inserted into a fluid feed orifice of an engine cylinder block, and
a transverse fixing plate having a first hole into which the nozzle body is fixed, and having a laterally offset second hole opposite the transverse bore for a screw for fixing the nozzle to the engine cylinder block to pass through,
in which nozzle:
at least around the transverse bore, the peripheral wall is thick, its thickness being greater than or equal to the diameter of the transverse bore, and
the peripheral wall has a thinner portion diametrally opposite the transverse bore because of the presence of an external recess facing the second hole in the transverse fixing plate.
2. The piston cooling nozzle claimed in claim 1 , wherein the distance between axes of the first and second holes of the transverse fixing plate is just sufficient to enable the engagement of a screwing tool over a head of the fixing screw and rotation thereof without coming into contact with the peripheral wall of the nozzle body.
3. The piston cooling nozzle claimed in claim 2 , wherein the screwing tool is an end of a robot arm with a circular cylindrical external contour and an internal contour adapted to grasp the head of the screw.
4. The piston cooling nozzle claimed in claim 1 , wherein the external recess is a flat parallel to an axis of the nozzle body.
5. The piston cooling nozzle claimed in claim 1 , wherein the external recess is a concave cylindrical surface having an axis parallel to an axis of the nozzle body and coaxial with an axis of the fixing screw.